.Net API wrapper for Simple DNS Plus Windows nameserver: A free .net wrapper for users of Simple DNS Plus, using the built-in HTTP API of Simple DNS Plus.
Adonis DNS Management Server: plug-and-play 1u rack-mount Linux server hardware with BIND pre-installed
Chami.com: WhoIsNot: Finds reserved, on-hold and available variations of domain names. Detailed list of features, free trial version, FAQ. [Windows]
Cisco: Network Registrar: A scalable DNS server. Free trial version, FAQ, technical documentation. [Windows]
Djbdns: Domain Name System tools, links, and tips. [Unix]
DNS Boss: Management software for Solaris, NT, Linux. Free trial version, documentation and instruction.
Internet Software Consortium: Non-profit corporation dedicated to developing and maintaining production quality open source reference implementations of core Internet protocols. BIND is available here for free.
Life with djbdns: Examples and howtos for djbdns.
Linux NIS(YP) Server and Tools: The Network Information Service (NIS) provides a simple network lookup service consisting of databases and processes. It was formerly known as Sun Yellow Pages (YP).
MaraDNS: A public-domain, open source Domain Name Server which offers both authoritive and caching features. Its main goals are security and simplicity.
Men & Mice: QuickDNS and DNS Expert tools. Free trial versions, support page including DNS glossary, FAQ, mailing list. [MacOS, Windows]
MetaInfo: DNS and DHCP server software for MS Windows, Linux, and Solaris.
Microsoft: Windows 2000 Server: Documentation and support for this product. Service packs and updates available.
Moreton Bay DHCP Server: Free, open source, cross-platform solution. [Linux, Windows]
MyDNS: A free DNS server for Unix that serves records directly from a MySQL database.
Power Domain Name Server: PowerDNS is a non-BIND nameserver based on open-source and proprietary software.
QIP: IP services management. Screenshots, trial downloads, documentation. [Unix, Windows]
Simple DNS Plus: Free trial version, screenshots, client testimonials, FAQ, tutorials. Also provides a Web-based DNS lookup tool.[Windows]
The Manual Page: DHCP-DNS: Free Perl package that allows dynamic DNS update using your DHCP server. GPL license. News, and a glossary of relevant technical terms.
UltraDNS Corporation: DNS management and directory infrastructure services. News, FAQ, DNS primer.
ZoneMaster: Open source project manages nameservers and zonefiles. Free download, development status, screenshot. [Perl, PHP source]